IMHE OpenIR  > 成都山地所知识仓储(2009年以前)
Alternative TitleAn Analysis on the Formation Condition of Debris Flows in the Jingjia Gully, Dongchuan, Yunna
李椷1; 吴济难2
Publication Place重庆
Keyword形成机理 雨洪型泥石流 蒋家沟 东川 云南
AbstractThe Jiangjia Gully is one of the gullies the Xiaojiang River basin where largescale debris flows occur frequently destructively. This spoon-shaped basin is characterized by its bare bed rock, broken mountain, steep topography, variable climate with the distinct wet season, and concetrative and intense rainfall. It is quite flows. A rainfall of more than 20mm can make debris flows burst out in the watershed. There is a big store of loose materials, which total 75 million cubic metres or so. The solid materials of debris flows are mainly generated by gravitational erosion. The are affected by the process make up 47% of basin area. The slope of the valley walls generally exceeds 20°. The longitudinal gradients of the gully bed are 7-8% in the lower reaches and 16-35% in the upper reaches respectively. In addition, the exsiting forest area is only 4% of the basin area as a result of serious deforestation. All these favours the generation of debris flows. In this gully, the collecting process of runoff is the process of debris flow flormation. The maximum flood discharge before the occurrence of each debris flow is 2-4 m3/s.
Other Abstract云南省东川地区的小江流域是我国雨洪型泥石流发育最典型、危害最严重的地区之一,而蒋家沟又是小江流域中规模巨大、危害最深重的一条泥石流沟。蒋家沟泥石流之所以形成,主要与流域的自然条件和人类经济活动密切相关,其中地质地形条件是发生泥石流的内在因素,而植被遭人为破坏和水的作用则是激发条件。
Document Type专著章节文集论文
Recommended Citation
GB/T 7714
李椷,吴济难. 云南东川蒋家沟泥石流形成条件的初步分析. 重庆:科学技术出版社重庆分社,1981:26-29.
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